<?php
function csubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = true)
{
    if (function_exists("mb_substr")) {
        if (mb_strlen($str, $charset) <= $length) return $str;
        $slice = mb_substr($str, $start, $length, $charset);
    } else {
        $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
        $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
        $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
        preg_match_all($re[$charset], $str, $match);
        if (count($match[0]) <= $length) return $str;
        $slice = join("", array_slice($match[0], $start, $length));
    }
    if ($suffix) return $slice."…";
    return $slice;
}
function createurl($url){
    return $url.Yii::app()->urlManager->urlSuffix;
}